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File:Cardinal gems.png|thumb|250px|Group of precious and semiprecious stones —both uncut and faceted— including (''clockwise from top left'') diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A '''gemstone''' (also called a '''gem''', '''fine gem''', '''jewel''', '''precious stone''' or '''semi-precious stone''') is a piece of mineral crystal which, in cut and polished form, is used to make jewellery|jewelry or other adornments.[http://www.askoxford.com The Oxford Dictionary Online] and [http://mw1.merriam-webster.com/dictionary/gemstone Webster Online Dictionary] However, certain Rock (geology)|rocks (such as lapis lazuli) or organic chemistry|organic materials that are not minerals (such as amber, jet (lignite)|jet, and pearl) are also used for jewelry and are therefore often considered to be gemstones as well....
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54
Geological surveys
52
Mines and mineral resources
36
Energy minerals
36
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taiwan
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Geological mapping
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American Libraries
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FEDLINK - United States Federal Collection
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Bureau of Land Management Library
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great basin gem joint venture (firm)
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gem
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united states. bureau of land management. denver service center
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gem tv
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